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Table 5 Prognostic capacity in addition to that of the baseline values of the outcome measures

From: Latent class analysis derived subgroups of low back pain patients – do they have prognostic capacity?

 

Follow-up time points

Outcome measure

Description of prognostic variable

Prognostic variable

2 weeks

3 months

12 months

Diff. of. adj. R2

Diff. of. adj. R2

Diff. of. adj. R2

Pain intensity (Numeric Rating Scale, 0–10)

LCA-derived subgroupings

Single-stage subgroups

0.053**

0. 045**

0.055**

Two-stage subgroups

0.047**

0.052**

0.047**

Existing subgrouping tools

STarT Back Tool

0.022**

0.006

0.008

Quebec Task Force classification

0.016*

0.013*

0.007

Baseline characteristics

Baseline leg pain intensity (0–10 Numeric Rating Scale)

0.047**

0.014*

0.040**

Baseline disability (RMDQ-23)

(0–100 = highest disability)

0.003

−0.000

−0.001

Recovery belief (0–10 = very likely)

0.060**

0.105**

0.056**

Results of first stage of two-stage LCA

All domain-specific patient categorisations

0.086**

0.127**

0.135**

Disability (23-item Roland Morris Disability Questionnaire, proportional score)

LCA-derived subgroupings

Single-stage subgroups

0.069**

0.078**

0.059**

Two-stage subgroups

0.061**

0.074**

0.050**

Existing subgrouping tools

STarT Back Tool

0.031**

0.040**

0.017*

Quebec Task Force classification

0.024**

0.042**

0.037**

Baseline characteristics

Baseline back pain intensity (0–10 Numeric Rating Scale)

−0.011

−0.004

−0.009

Baseline leg pain intensity (0–10 Numeric Rating Scale)

0.024**

0.034**

0.041**

Recovery belief (0–10 = very likely)

0.036**

0.115**

0.114**

Results of first stage of two-stage LCA

All domain-specific patient categorisations

0.086**

0.155**

0.154**

  1. Diff. of. adj. R2 = difference in adjusted R2 obtained when the prognostic variable was added; LCA = Latent Class Analysis
  2. *P < .05, **P < .001